Hooked up with my ex, what does it mean?

superconfuzed
So my ex girlfriend broke up with me about 6 months ago because of some communication and distance issues (she was going to college out of state).

She still is attending this college, but is back home for the summer and we have hung out twice.

The first meeting was just a friendly catch up, but with plenty of flirting. I have been pretty confident about being single as of late and was acting quite good. I called her later that week asking her to a movie, which she agreed to.

Anyway after the movie, I drove her home and she invites me insides to check out the house she is house sitting. Things lead to things, and I end up spending the night with her and having some great sex.

Next morning, things were very great, not awkward or sad. We hung out in the backyard and played with the dog and shot frisbees. I had to leave for work, but as I'm leaving I tell her how much I enjoyed seeing her and how I'd like to see her again..

She says "I don't want to go through 'this' again" (meaning dating). I got the impression she has moved on a bit more emotionally than I have.

So. Do girls have sex with guys they dump just because they can? Is it something more? How do I go about handling this?

p.s. I noticed her bookmark was a letter I wrote her about 6 months ago, and she reads daily. Also, she told me (and I definitely believe her) she hadn't been with anyone since our breakup, which is extraordinary because she is in college and reallly pretty.
Hooked up with my ex, what does it mean?
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